High-speed solid rotor induction motor design with improved efficiency and decreased harmonic effect

Gülbahçe M. O., Kocabaş D. A.

IET ELECTRIC POWER APPLICATIONS, vol.12, no.8, pp.1126-1133, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 8
  • Publication Date: 2018
  • Doi Number: 10.1049/iet-epa.2017.0675
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1126-1133
  • Keywords: rotors, stators, harmonics, air gaps, optimisation, numerical analysis, design, induction motors, high-speed solid rotor induction motor design, SRIM, decreased harmonic effect, rotor losses, space harmonics, air-gap, driving frequency, unconventional stator slotting pattern, winding distribution, nature-inspired numerical optimisation techniques, fundamental winding factor, SLITTED FERROMAGNETIC ROTOR, MACHINE
  • Istanbul Technical University Affiliated: Yes


Depending on its mechanical and thermal advantages, solid rotor induction motors (SRIMs) are widely used in demanding high-speed applications. Since eddy currents are set free in SRIMs, great part of rotor losses is caused by space harmonics created in the air-gap. Rotor losses are increased tremendously in high-speed applications with the remarkable increase in driving frequency. Here, an innovative design representing a novel stator and rotor combination that is not achieved in previous studies is proposed by structural changes to stator to eliminate major effective space harmonics. An unconventional stator slotting pattern and winding distribution is calculated by nature-inspired numerical optimisation techniques while keeping the fundamental winding factor relatively high. An example design where novel concepts are implemented is presented and a comparison is given in terms of important operational quantities with that of a standard SRIM.